Heavy squaring-clamp



0. BERGSTROM. HEAVY SQUARING CLAMP. APPUCATION FILED NOV. 17, 1919.

Patented Apr. 6, 1920.

UNITED s'ra'rns ra'rnur curios.

OSCAR BERGSTROM, CF CHICAGO, ILLINOIS, ASSIGNOR TO HANDY MANUFACTURING COMPANY, OF CHICAGO, ILLINOIS, A CORPO'RATION OF ILLINOIS.

HEAVY SQUARING-CLAMP.

Specification of Letters Patent.

Patented Apr. 6, 1e20 Application filed November 17, 1919. Serial no. 338,565.

. object of the invention is to'provide a machine of this class which is very positive and accurate in operation, and-which can be readily adjusted either in original manufacture or in reconstruction to a variety of lengths of articles to be worked upon, thereby doing away with the necessity of the manufacturers carrying a large stock of complete machines Ora large stock of expensive side members for use in lengthening or shortening the capacity of the machine. The invention consists in means for carrying out the foregoing objects which can be easily and cheaply made, which is satisfactory in operation and is not readily liable to get out of order. More particularly the invention consists in many'features and details of construction to be hereafter more fully set forth in the -specification and claims.

Referring to the drawings in which like numerals represent the same parts throughout the several views,

Figure 1 is a plan view of the mechanism illustrating this invention in its preferred form.

'Fig. 2 is a side elevation of the mecha nism of Fig. 1. V

In constructing the machine of this invention two end frame members 10 and 12 are provided adapted to rest upon the floor 14 of the work shop. These end members are at such a height that the work 16 to be engaged and manipulated by the machine will be at a convenient height above the floor for access by the operator and they are held apart at their bottoms by two parallel rods 18 of convenient size for ready handling and replacement, the same being secured to each support 10 or 12 as the case may be by suitable lock nuts 20, while their upper ends. are spaced apart and connected together by a pair of horizontally separated rods 22 and 24 located as shown at approXimately opposite sides of the machine.

One end of each of these rods 22 and 24 is detachably secured to a support as 10 by lock nuts 26 corresponding to nuts 20 used on lower rods 18 while the opposite end of each rod passes through the other upright support 12 and is secured on the outside thereof by a nut 28. 1 The surface of the end support as 12 adjacent to which these nuts 28 are placed which is toward the inside of the machine is carefully surfaced on a line 30 at right angles to the rods 22 and 24. On

these rods 22 and 24 and abutting this smooth surface 30 is a front plate casting carrying a front plate 84 in accurate parallelism with the face 30 heretofore referred to. This casting 32 is providedv with de pending lugs 36 which embrace the respective rods 22 and 24 in close fit and the brackets 36 are secured to the rods by set screws 38. Owing to the length of-these brackets 36 along the rods 22 and 24 and the fact that the casting 32 fits closely along the line 30 on an end support 12, a very-rigid construction is established at this point tending to insure the rods 22 and 24 being accurately at right angles to the upright support 12. These screws 22 and 24 are smooth and on them, between the front plate described and the opposite support 10 of the machine, slides a back plate casting or cross head 40 carrying a back plate 42 accurately parallel with front plate 34. This cross head 40 is supported on horizontally wide bearin s 44 which embrace the rods 22 and 24. hese bearings are of such a length as to insure the back plate 42 always moving along the rods 22 and 24 in parallelism with the front plate 34, this so that work 16 clamped between the plates is trued and squared up.

J ournaled in the front frame member 12 is a horizontal shaft 46 rotatable by any suitable means as, for instance, a hand wheel 48. Beyond the left hand side of the casting 34, heretofore described, this shaft 46 is provided with screw threads 50 engaging a suitable depending member 52 on the underside of cross head 40. The result of this construction is that as wheel 48 is rotated, cross head member 40 and attached parts is moved backward and forward along the rods 22 and 24 in a direction depending on the direction of rotation of the hand wheel &8. Members 32 and 40 are provided with suitable sidewise adjustable clamp members 54; without novelty, and therefore not detailed. V

The builder of a machine of this class has only to make one set of standard parts of everything except the rods 18, 22, 24c and the screw 50. As to these specifically enumerated parts, he keeps groups of parts of different lengths and when he receives an order for say a 30 inch machine, 2'. c. to work on a product thirty inches long, or thereabout, he has only to equip a standard set of parts, other than 22, 2d, and 18 and screw 50 with these parts designed for 30 inch work. If his next order is for a machine for work of say fifty inch length, he merely takes the standard end and clamping parts and supplies them with the necessary screws and rods for a machine of that length. As the rods 18, 22 and 24' are in effect identical for a machine of given length, he really only has to supply two kinds of variable parts in order to vary the capacity of the machine at a minimum of expense. In addition to the foregoing advantage, the use of rods 18, 22 and 24 fords all the rigidity which is required and at the same time materially lightens the weight of the machine over standard constructions previously made.

Having thus described my invention what I claim as new and desire to secure by Letters Patent, is

1. In mechanism of the class described, a pair of vertical end frames, parallel rods top and bottom of the machine, two of them being at the top, detachably connecting said end frames, a front plate mechanism supported by and detachably secured to the top rods in rigid engagement with one end frame, a cross head slidable on the upper rods carrying a back plate in parallelism with said front plate and means for reciprocating the cross head.

2. In mechanism of the class described, a pair of end frames rising from the fioor, a plurality of rods detachably connecting said endframes, a front plate supported by two rods and rigidly secured thereto adjacent to one end frame, said front frame mechanism serving to square the rods to the end frame and rigidly hold them in place; a cross head slidable on said rods between the front plate nd the opposite end frame, said cross head being provided with relatively long bear ings extending along said rods, and means for reciprocating said cross head along said rods.

3. In mechanism of the class described, a pair of end frames connected together by a plurality of rods, two of which are at the top of the machine parallel to each other, a front plate mechanism adjacent to one of the endframes and so secured theretoas to reinforce it and hold it at right angles to said rods, a cross head slidably mounted on the two upper rods, having bearings so engaging said rods as to insure said cross head being in all positions along the rod, parallel to itself, a back plate on said cross headcarried in parallelism with the front plate, and a screw member rotatably mounted in the front plate mechanism and screwthreaded into the cross head mechanism, and means for rotating said screw.

In witness whereof, I have hereunto sub scribed my name inthe presence of two witnesses.

' OSCAR BERGSTROM. Witnesses I DWIGHT B. GHEEVER, I MINNIE S'rnnnnnne. 

